CastPlayer send correct selected audio track to receiver.

I have media with multiple audio tracks in the manifest, but when I create the MediaItem, I can’t see a way to specify the initial audio track. Besides, I would like to be able to change the audio track in the CastPlayer during the playback, in case the user uses the sender to change the audio.

Exoplayer version: 2.12.1

// If I don't set the metadata, the title doesn't appear in the castMiniController, whereas it did appear in exoplayer 2.11.x
MediaMetadata metadata = new MediaMetadata.Builder()
                .setTitle(currentShow.getFormattedTitle()) 
                .build();

MediaItem mediaItem = new MediaItem.Builder()
                .setUri(uri)
                .setDrmLicenseRequestHeaders(hm)
                .setDrmLicenseUri(drmLicenseUrl)
                .setDrmUuid(C.WIDEVINE_UUID)
                .setMediaId(currentShow.getFormattedTitle())
                .setMediaMetadata(metadata)
                .setMimeType(mimeType)
                .build();

I can’t obtain the trackSelector in the CastPlayer’s implementation, as it basically returns null:

On the other hand, when we change audio tracks in settings for the local player, we do the following:

    public void onAudioSelected(AudioCheckableItem audioItem) {
        MappingTrackSelector.MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
        if (mappedTrackInfo == null) {
            return;
        }

        int rendererIndex = -1;
        for (int i = 0; i < mappedTrackInfo.getRendererCount(); i++) {
            TrackGroupArray trackGroups = mappedTrackInfo.getTrackGroups(i);
            if (trackGroups.length != 0) {
                switch (player.getRendererType(i)) {
                    case C.TRACK_TYPE_AUDIO:
                        rendererIndex = i;
                        break;
                    case C.TRACK_TYPE_VIDEO:
                    case C.TRACK_TYPE_TEXT:
                    default:
                        break;
                }
            }
        }

        if (rendererIndex == -1)
            return;

        TrackGroupArray trackGroups = mappedTrackInfo.getTrackGroups(rendererIndex);
        DefaultTrackSelector.ParametersBuilder parametersBuilder = trackSelector.buildUponParameters();
        parametersBuilder.setSelectionOverride(rendererIndex, trackGroups, new DefaultTrackSelector.SelectionOverride(audioItem.getGroupIndex(), audioItem.getTrackIndex()));
        trackSelector.setParameters(parametersBuilder);
    }

I can’t find any documentation about this and the only question related (but with subtitles) is at SO and doesn’t have any answers: https://stackoverflow.com/questions/61396776/change-subtitle-using-castplayer

[marcbaechinger]

I don’t think you need to fork the library. You need to instantiate the CastPlayer by passing your custom MediaItemConverter implementation. I think looking into the DefaultMediaItemConverter is a good idea. Your implementation can delegate to DefaultMediaItemConverter so you only need to implement toMediaQueueItem to add the thumbnail.

[aiescola]

Hi @marcbaechinger thanks for the reply. Apologies, I couldn’t answer earlier. I will study what you said.

As for the second part, I guess I have to do that custom MediaItemConverter anyway to support the extended controls view in the sender. If there is any guide on how to implement a custom MediaItemConverter, let me know. For the moment I will fork the library and copy the behaviour of DefaultMediaItemConverter. Thanks.

Perhaps it was too soon to deprecate the method addItem that used a MediaQueueItem in CastPlayer.